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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e553b23a5e3e150352e432e241eaaecff920d218d54695c432b7653f32528b1b' 
  AND token = 'kbe5EOUDlB+dTx4qtdljoRWYcSWt3cCoLxN8A/WZets=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}