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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa7bd8f9f9447b7dcb314b0a2b02a7fcd0153b5334d3d07cf4b606a2b4e1f80' 
  AND token = 'vJQLgZeQ2wGIU4uTx9sA9KlevEYRGgWiAXSDWuxwlaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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