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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248178f8762144999321402d693e7f9b49768fc18f3321937a4000dcc213b46d' 
  AND token = '9SZZqZI0dXCToVijT/SurVHXcQPRSVaAm3UhrdJBmiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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