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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620399d54fb1234477a159c4a68f091ca1a29fd933d2272f3c50fb357dde0832' 
  AND token = 'D1lXEZAXYH9JjdmdZ6iyTXuw3DrQv9VpjFycTQ0Zj9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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