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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ca7ac572cd8524ec699bb9d3cd76a6a66e2bb8e422bd212e0e218aeca04b26' 
  AND token = 'iTGX9AjIxiIpCD/P0AUyphJmP/7kFmPs8d65qCafQik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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