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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc2e221b416384bab9994b2c7b6a182030836cc66415d2f75af5839a08187a4' 
  AND token = 'ox45CD7Dle1aSErjT23XGF39yK9YPPlV3j52Vu0xvCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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