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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd862618e35592f20060c6934ca8baa179f6a446d9d41a01fc8f342b4a8f734c6' 
  AND token = 'qAbMEAXfdIQ8sG6Uyt1tAKH3zPJEroWG3BZEuCpgcEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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