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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc005a5197cc8780000d564a50caa591ae7c76a302384658cac06131a2e631a7' 
  AND token = 'VnE3xoViI+Y0Lx2/kbjQFrPXAKybHRwlW367IH1SGiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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