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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb16a834beb5f97766c7316aecad95d8c632a65752c4067dc9f094f9e39b3ce3' 
  AND token = 'wJx1h+4Vd/+TJSqBaMas97lBrRx6xeXxb4LFoo8UMLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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