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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2c6c493e63a8756787967a26e710c5d7de38c49339153f42aca9d364a20a6c' 
  AND token = 'bnnCqonRlyh6SuVg+BvBtYMeFfE3tyEi1YjO+6s6Gl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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