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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea06d6e3d207b7c7e4799ea0e68e27c0776ee27e5dd348e55b9ae7d07ffd611' 
  AND token = 'V7WZk8ra8lsYEmNF3nLpjvedPzDOEy2GW9qaJz0wHA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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