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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '348c3f11ee2f9fb63a5696e8e3c51c3d6189d322da9c08bb058fed8145970279' 
  AND token = 'hf0ck8AhXzCd6bKFtjLDR8C0eRpvk3ijhx+4vn8iRi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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