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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3bd87ef81b823fb8c0bb1820f7ad7c1f2c272aef9f6234a622293925fbd920' 
  AND token = 'nYvuarmG11qZkrkCJbkvcT8a566gBbEFao6NJ3Xgs8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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