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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d2dfec656967dad69bbe9a2511fc5de7fc20f52b36d50d91d4f19c14581681' 
  AND token = 'YmsZsXw4seEufCbQr5mCKsy+8b91en4rGJ5j8Vpegbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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