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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f79111a74fe035ec5918c4b81297ad578a4c8f7545d1b74eaa1270ebafd1126' 
  AND token = 'P/5OCfOLyg4wDxPen3w6nKOQ44pOnzdmeJHwdKvmR/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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