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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0ab5421b97dd643241618905d7de1c463a33ec00d68911c0ef41ca581045dd' 
  AND token = 'Ty2OAuD22IhVVBoiyz8ldIK6fYNNumgdWV/4vDb2Pyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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