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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37536f010d4b8bfc8a27e6ed20c77df7b236759c66fd9994f6bc0a8c33d29a0' 
  AND token = 'TN0ctaMRsrT2v7MyYxsfwHNaqbPpXr6ASKrcvhYHVqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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