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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eceda8d90eb9d18b95fd3f03d9c6c2b2b56c3f228db43bedabd2411303434f6' 
  AND token = 'Ew//S80ZhFEksIQ7jflEDi2ycXzrHRE4h2w2gm0fcsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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