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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32f2632a1030e90186f1f005614b7f53f3083077d18f3efbb0cd7518cda9afa' 
  AND token = 'Gk4JRq7G8nEAAo5ZtKYEklwLK5RfWWa2dfeTlYjqjbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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