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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69d11c1e5d8611f421c261828f633e35db976d489a922f862d1e6592a90a142' 
  AND token = 'PQF4IvjxXv1xP6zFgYYD/z/+C7/0jVS8iPC1Zrilj6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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