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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dfd2cd3266ec72df1f3561847cc8b2e35fc1deff5c73e365797ecdab6615bee' 
  AND token = 'KaBOMpLDRzFtil4CZl63Eg7toRqNze6P0ExXR5qpZDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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