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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99bbb051fcbf6e9d16cd3981d77f7bd222723cd1b07ac195d650b2549845ce52' 
  AND token = 'tQ92tToPTxKdmObHuEx0J28NuAqVS6hiTvn9lgZhpA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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