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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99588a1c949c5eb394cb66e50a2fd3038853c0532af244eb7a43ca8a8c46e268' 
  AND token = 'yIp8lJ1ZH7wnSgPpY1/ClY+MBVTCPhBlCC1cpk0D3ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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