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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6367af8083fffbf1ecada20c6aad349751a0cde4929cc4f10bb0a50f30558d6e' 
  AND token = 'YbEfy5KEz302qpiiUCtwSQVDsxuM/C7G5sJ81JKfZlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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