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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ed29f25229b4c20a758c685eb63155885f6bc001591d52381b5873266d21ee' 
  AND token = 'p7aFVT+hTtJMX6qCed1bQ+YfH8K1NOi55b58drbLHcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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