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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0666eb6885a15f2769d23fc59fab1de30ffd714495d95303c7419f7890c09e91' 
  AND token = 'R6K9DgyyVcZa7aCFqdflAUrBHep5356AP4mlSWA+Fjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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