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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb90a14db2dd328fdc7d04749e9288d2b12a935772e65a4095fae52c9a227bf' 
  AND token = '9txYxwDUm9jR0nYFcamUKNoh6MpY6znsKnWqfc6XFYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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