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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b508cf01f60ebd40ad185dc12fb16b5d75f00bceaab86a44943b78f76c773cf6' 
  AND token = 'nkj1o7llScoXClYJinBCwoxn8maT5+PalSNy7ieitg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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