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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db968d1c592e4ebc92b4d2bc98bdc6fcf58dc103e88483c5fd3c4e59dcd9146' 
  AND token = 'FKOWLr+h+KwuliO0yHdPW5ELS5VNmmWFnGhXTDaNLMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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