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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853cd117c562f6ced0b68ae636c11caf56b88fd56d1bce49f66c106425bbcea7' 
  AND token = 'HoTN0jidcKtq7TUUCt1knKB3I0A+qQ6T4Xe1RP7Fs7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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