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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9910b938493422f6d76a56a16bb57fbcfc70f0917881123970a2213c9bcb9ee4' 
  AND token = '6tuNAy0/CjZ6x4tsWPK3oCsk1ut+htf/UTA428Xa540=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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