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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8ed88b6250ca833305bb68f9b19b21cb4bbcbd0165a76d3fc8aa819cbf411a' 
  AND token = 'jv3vdOIxpPkHCH5/YR4QqtmtYGIKxQyALsRlNP6zM8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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