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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9601883bb8b4f5d7c0cd1592c2ce3987a51959b97c32283ec7ae280e8d7b0e9' 
  AND token = 'WNNuAzc6lVzzFK/8C8Pzr0FBXZx8ewmUvP+gyvSa6zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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