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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d589bfc9f51345bd426d6dcfc2dc33c844602a113429c84470e72054c9216aa' 
  AND token = 'VOBSO9bfB4IKt1mmg4T9BWL8stkX8BwxwQxibb02iqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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