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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcb4d40cd9988a6ebeaca7c08d1e6864f39316a5b490ba08b9542dcf8f484b8' 
  AND token = 'kPSuTvpL6ruaOkUKQu1YCSY/6/3/AsfmMu9dMEUeNhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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