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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33ea1d9a2e79a7e9b5550c58db74eb97c2dc8cdb640982735fc87967c86c84c' 
  AND token = 'gajKExGVEV3Cu9uR/Szne6k2jTcSk0XecYgdCrVR/6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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