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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f126918acef14d0732a3c6b5ee7626cd08218b7ae7acb9cf962a974410c4992d' 
  AND token = 'ds3qRSuHY7VlGHLmAxJFmi/MfD8Q3TLbBis9JtOC4BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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