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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5d3baa396b2f97eaca2ab20deeb79e442f7643b25c325be4b71e7ec08f94ed' 
  AND token = 'Xb/jy3wd8v/hk6OSWdNKt6tZQfO9131dZqZc6xthdA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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