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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e375d37560efd5b16b518fce3d6cf60330edde2d5598bc32a96a509ba4da59' 
  AND token = 'ezZO59e0W22vFSKrEpkDo6sR0Q3biwijyPaqI4ga87U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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