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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a3646ee49b176a31826c9a9a1a565eafe0e4ee6ce52a9cb6acd29add9afe2d' 
  AND token = '32IZQ93i9NgZDOfPDU3QNe1hV5jmYKMtGsHUZG22Ig0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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