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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219a44956530b9457781dd6cde8b60d6d3445047864dec313adc00f11791b62b' 
  AND token = 'anA5AwaY1AmguyvOXagkjoTbp3wjBDGC2qXYE2tE1jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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