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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31c57d42b9c198499a3dc4ac72419ef928db06940855e5a88c82fa83f7e7e68' 
  AND token = 'UgfhLX0wNP3/siLdFlGcjVlaG0von+rPQnPQS5V0WsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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