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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43024a235779fbd06b3d30ddeff8c4e87dcaa2130b4e5163127728babab39fc4' 
  AND token = 'paQ9YxpdaVKVwzHtyfOwg6AxPIHNOqN6QfO14eB5bTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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