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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8870116ca47f20b9140faad06b8ba7a52d07f8f72134e5060c170c3b808415' 
  AND token = '6PxMDdp+PLiAX9lGZudQFQ4jRh+puvDcupspdbv6d08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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