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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2728d3aa04aa0c6be835cad8d8dbb7072e0e6673ea72ce3df248f5c9a9c81e0b' 
  AND token = 'HXcYba3GPu/KKmpLZOHavyx2oP7SiQEXRRTXnGM3OJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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