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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e1a891b71feb4233cce8310dc698912ae126b8af1aeefcbf422d21c286416c' 
  AND token = '8zP9y22o/idWmKVPLiKBGWoJpjUms5HeHzN7nvAWkh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00177

JSON explain

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