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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2d94465b493cf60e3651a3591d8641dd4a57a0f85a7d8b20b7b5d89bad9eee' 
  AND token = 'E1LtnvKEjR3i/REcFTUrtnEcMp5yP8FCOA8gCtbM0g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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