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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ec151b4435a44b499dc2b5d60ea6ddce186863dbe86be7b164a872accbb287' 
  AND token = 'CiHg0WmY0VJcGXt30cG2hlJjz86i2SFlmNlOw6rg/J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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