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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7afef3078afc602a12d27a4dcf8ede60c7e1788b373c2514961e07f94d8fc1' 
  AND token = '32NgFHXrX8h5wAQMT9cs5iTvEP/oQo/8QbMtbdT9S6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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