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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8d2112a8708b6c73ceb86ccc8cd593dbaf11b221e22c4fa5ba076600a01ad5' 
  AND token = '7bpp1DpPuF8AiB3Nds1DfnLJNl13vN102u0KayT5MHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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