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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd8650790e07e32666cf14ddb759190539ae974174e5035c48651854685c09e' 
  AND token = '9OdGX0xwp1Sjru66TuI9B85RTk5JXj9Q4BjPEMsO8n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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