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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f698fa81bb96a0b1811d7b40d611addd709ee338c72f8a77bd455dc8b27aacbd' 
  AND token = 'oV7JlpjuTvJNjkDsweSd+9+gGEP07d489TGJKSPog6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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