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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae713a13ac94a809f600fd293fb9c9628a29658969cf4c90a3ac337dda5f93aa' 
  AND token = '2qzLE4a/j+mbO9qmMsPVdiSKbO8bWU775fmRRP3Zchc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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