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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48092cfdba8bbc2b5659ca89f27ab398f855f3e1e7a13fe243503cfb5cf77e7b' 
  AND token = 'IAKhvFwUYj5fsSjw7jdpeYD+XG9ABmO2Rz7sFtwfd1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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