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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0146f553ba603645ea76a635bc23bdaced78f8d9d5a7587d82ce8ea5d8288d7b' 
  AND token = 'FuKJjemJ1VKJe0LnmKBSKYUQOSRpS3tU0mi4XzZnYIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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