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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22595e36b7da3f4834b10bd27d0210441cf9d3c76e12d7756c00cce7eaefc616' 
  AND token = 'vjwoKhS3T8OxGtDnt5LkISYFLeDzfDReA1+K3CLSQJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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