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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1836180baee9e9de918a8b3cbb818c057974d94255d13e882da063d04f30100b' 
  AND token = '90vxc58CKU4g+TGMrZdgEgFVr3u7YkxFo6XgIc1e+j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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