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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67368ada4194fb4ac98f7a218d2e5ec79e1a67d9a37884193bf025500d2122c4' 
  AND token = 'pmyhFyY4mE26wutch4c8W557Se1Ceac29XsZ7EzKPEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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