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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c389ff549fd595bc756132793ff40a59d38a6ac1cd8cc2e91b361e517bde52' 
  AND token = '3ny6F9geEQhGTsmMNsB5g2GE0lksa7QfHiZrE7cpbc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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