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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa351cb19afc81deb1f3f4243fb5e24523bc74bab685d05f8aa7e18b951348e' 
  AND token = '4yG7pt6RejiSdEJ4Zw+XGJmqun0WQWlLvOJWUEODEjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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