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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd24de0dc758677c54b6788b4a903103e43591984876c331d6d09f9863f9bb2d' 
  AND token = 'StMYKef482SCGUGAuuBKbTcDBFhDtBpDeHgkgrytzV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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